... recognise and learn from the mistakes in your investing strategy?
... reorganise a life based on having less money?
... deal with the emotional turmoil of losing lots of money?
... deal with the emotional turmoil of uncertainty?
... cope with facing an imminent retirement where you don't have the funds to live comfortably?
This post isn't really answerable because it is too vague. Even as a comment on hard times, there isn't much to go on here.